The ONLY all season tyres for the 43 are 21 inch ones, when fitted to the 21 inch there is next to no skipping.
Regardless of what the email says there are NO all weather tyres available for the 43 in 19 or 20 inch, that information is straight from AMG customer services. The tyres fitted to my car are Michelin latitude sport, will be interesting to find out what yours comes with. If all weather tyres were available surely the car would come with them fitted from the factory rather than MB covering the cost of fitting them later, all land rovers come with all weathers fitted.
Your dealers information is wrong, give AMG customer services a call, the direct number is 02076606938, will be interested to hear what they say.
2017 GLC AMG43 premium plus, night pack, leather, intel lights, 360 camera, side steps.